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  <div class="section" id="cmake-system-version">
<span id="variable:CMAKE_SYSTEM_VERSION"></span><h1>CMAKE_SYSTEM_VERSION<a class="headerlink" href="#cmake-system-version" title="Permalink to this headline">¶</a></h1>
<p>The version of the operating system for which CMake is to build.
See the <span class="target" id="index-0-variable:CMAKE_SYSTEM_NAME"></span><a class="reference internal" href="CMAKE_SYSTEM_NAME.html#variable:CMAKE_SYSTEM_NAME" title="CMAKE_SYSTEM_NAME"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_SYSTEM_NAME</span></code></a> variable for the OS name.</p>
<div class="section" id="system-version-for-host-builds">
<h2>System Version for Host Builds<a class="headerlink" href="#system-version-for-host-builds" title="Permalink to this headline">¶</a></h2>
<p>When the <span class="target" id="index-1-variable:CMAKE_SYSTEM_NAME"></span><a class="reference internal" href="CMAKE_SYSTEM_NAME.html#variable:CMAKE_SYSTEM_NAME" title="CMAKE_SYSTEM_NAME"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_SYSTEM_NAME</span></code></a> variable takes its default value
then <code class="docutils literal notranslate"><span class="pre">CMAKE_SYSTEM_VERSION</span></code> is by default set to the same value as the
<span class="target" id="index-0-variable:CMAKE_HOST_SYSTEM_VERSION"></span><a class="reference internal" href="CMAKE_HOST_SYSTEM_VERSION.html#variable:CMAKE_HOST_SYSTEM_VERSION" title="CMAKE_HOST_SYSTEM_VERSION"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_HOST_SYSTEM_VERSION</span></code></a> variable so that the build targets
the host system version.</p>
<p>In the case of a host build then <code class="docutils literal notranslate"><span class="pre">CMAKE_SYSTEM_VERSION</span></code> may be set
explicitly when first configuring a new build tree in order to enable
targeting the build for a different version of the host operating system
than is actually running on the host.  This is allowed and not considered
cross compiling so long as the binaries built for the specified OS version
can still run on the host.</p>
</div>
<div class="section" id="system-version-for-cross-compiling">
<h2>System Version for Cross Compiling<a class="headerlink" href="#system-version-for-cross-compiling" title="Permalink to this headline">¶</a></h2>
<p>When the <span class="target" id="index-2-variable:CMAKE_SYSTEM_NAME"></span><a class="reference internal" href="CMAKE_SYSTEM_NAME.html#variable:CMAKE_SYSTEM_NAME" title="CMAKE_SYSTEM_NAME"><code class="xref cmake cmake-variable docutils literal notranslate"><span class="pre">CMAKE_SYSTEM_NAME</span></code></a> variable is set explicitly to
enable <a class="reference internal" href="../manual/cmake-toolchains.7.html#cross-compiling-toolchain"><span class="std std-ref">cross compiling</span></a> then the
value of <code class="docutils literal notranslate"><span class="pre">CMAKE_SYSTEM_VERSION</span></code> must also be set explicitly to specify
the target system version.</p>
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<li><a class="reference internal" href="#">CMAKE_SYSTEM_VERSION</a><ul>
<li><a class="reference internal" href="#system-version-for-host-builds">System Version for Host Builds</a></li>
<li><a class="reference internal" href="#system-version-for-cross-compiling">System Version for Cross Compiling</a></li>
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